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Process for the production of acetic acid

A technology of acetic acid and methyl acetate, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate, etc., can solve problems such as reducing the efficiency of carbon monoxide

Active Publication Date: 2020-05-19
CELANESE INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process disclosed in US Publication No. 2013 / 0116470 increases the recycle of acetic acid due to the need to cool the reactor, which reduces carbon monoxide efficiency

Method used

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  • Process for the production of acetic acid
  • Process for the production of acetic acid
  • Process for the production of acetic acid

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Experimental program
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Embodiment approach

[0120] E1. A method for producing acetic acid, said method comprising:

[0121] In the reactor, in the presence of 0.1% to 14% by weight of water, metal catalysts, methyl iodide and iodide salts, at least one selected from the group consisting of methanol, dimethyl ether, methyl acetate and mixtures thereof carbonylation of a reactant to form a reaction medium;

[0122] splitting the reaction medium into a liquid recycle and a vapor product stream comprising acetic acid, methyl iodide, methyl acetate and water;

[0123] condensing a first portion of the vapor product stream to form a liquid stream; feeding a second portion of the vapor product stream to the first column;

[0124] feeding at least a portion of the liquid stream to the first column; and

[0125] A side stream containing acetic acid product is drawn from the first column.

[0126] E2. The process of embodiment E1, wherein 1% to 50% by weight of the vapor product stream is condensed to form a liquid stream, and...

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Abstract

A process for the production of acetic acid is disclosed wherein the reaction medium is divided in a flash vessel into a liquid recycle and a vapor product stream comprising acetic acid, methyl iodide, methyl acetate and water. The vapor product stream is condensed into a liquid stream rich in acetic acid, and this liquid stream is sent further to a distillation column for recovery of acetic acid. The method advantageously improves the capacity of acetic acid production while reducing the amount of recycled acetic acid.

Description

[0001] related application [0002] This application claims priority to US Provisional Application Serial No. 62 / 058,936, filed October 2, 2014, the disclosure of which is hereby incorporated by reference in its entirety. Background technique [0003] Among the currently employed methods of synthesizing acetic acid, one of the most commercially useful is the catalytic carbonylation of methanol with carbon monoxide as taught in US Patent No. 3,769,329, which is incorporated herein by reference in its entirety. The carbonylation catalyst comprises a metal catalyst such as rhodium dissolved or otherwise dispersed in a liquid reaction medium or supported on an inert solid along with a halogen-containing catalyst promoter as exemplified by methyl iodide. Most commonly and usefully, the reaction is carried out by continuously bubbling carbon monoxide gas through a liquid reaction medium in which the catalyst is dissolved. [0004] Methanol and carbon monoxide were fed to the reacto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/12C07C51/44C07C53/08
CPCC07C51/12C07C51/44C07C53/08C07C51/15C07C51/09C07C51/00
Inventor R·D·沙弗
Owner CELANESE INT CORP
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